1)A triangle has sides that measure 3 cm, 8 cm, and 4 cm. Do these measurements form a right triangle?
A. Yes
B. No

by using Pythagoras theorem,

a^2 + b^2 = c^2

LHS

3^2 +4^2

9 + 16 = 25

RHS

8^2 = 64

As both the sides of theoram aren't equal so the triangle with these measeures cant form a right angled triangle

18

step-by-step explanation:

draw the shape and you will see that f and k are actually at adjacent vertices (points of the hexagon that are neighboring).   so find the distance between (1,2) and (4,2).   that is easy since (1,2) and (4,2) is just a vertical distance to count, which is 3.   it is a regular polygon which means all sides are congruent.   you have 6 sides (hexa) so multiply 6 by 3 to receive 18.